posix/lib/psxdll/unistd/dup.c

   1 /* $Id: dup.c,v 1.4 2002/10/29 04:45:46 rex Exp $
   2  */
   3 /*
   4  * COPYRIGHT:   See COPYING in the top level directory
   5  * PROJECT:     ReactOS POSIX+ Subsystem
   6  * FILE:        subsys/psx/lib/psxdll/unistd/dup.c
   7  * PURPOSE:     Duplicate an open file descriptor
   8  * PROGRAMMER:  KJK::Hyperion <noog@libero.it>
   9  * UPDATE HISTORY:
  10  *              13/02/2002: Created
  11  */
  12
  13 #include <unistd.h>
  14 #include <limits.h>
  15 #include <errno.h>
  16 #include <fcntl.h>
  17
  18 int dup(int fildes)
  19 {
  20  return (fcntl(fildes, F_DUPFD, 0));
  21 }
  22
  23 int dup2(int fildes, int fildes2)
  24 {
  25  if(fildes < 0 || fildes >= OPEN_MAX)
  26  {
  27   errno = EBADF;
  28   return (-1);
  29  }
  30
  31  /* TODO: check if fildes is valid */
  32
  33  if(fildes == fildes2)
  34   return fildes2;
  35
  36  close(fildes2);
  37  return (fcntl(fildes, F_DUPFD, fildes2));
  38 }
  39
  40 /* EOF */
  41